#include <stdio.h>

int str_len(char t[ ]);

int main(void)
{
	char s[ ] = "Hello";
	
	printf("length = %d\n", str_len(s));
	
	return 0;
}

int str_len(char t[ ])
{
	int i;

	i = 0;
	while (t[i] != '\0')
		i++;

	return i;
}